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Revenue from Contracts with Customers (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disaggregation Of Revenue [Line Items]                      
TOTAL NONINTEREST INCOME $ 7,647 $ 7,441 $ 6,994 $ 6,520 $ 6,705 $ 6,478 $ 6,306 $ 6,010 $ 28,602 $ 25,499 $ 24,051
Service Charges on Deposit Accounts                      
Disaggregation Of Revenue [Line Items]                      
Noninterest income                 4,514 4,254 4,077
Debit Card and EFT Fees                      
Disaggregation Of Revenue [Line Items]                      
Noninterest income                 3,522 3,351 3,089
Trust Fees                      
Disaggregation Of Revenue [Line Items]                      
Noninterest income                 7,475 7,126 6,431
Insurance Agency Commissions                      
Disaggregation Of Revenue [Line Items]                      
Noninterest income                 2,919 2,621 2,407
Retirement Plan Consulting Fees                      
Disaggregation Of Revenue [Line Items]                      
Noninterest income                 1,489 1,684 1,857
Investment Commissions                      
Disaggregation Of Revenue [Line Items]                      
Noninterest income                 1,406 1,103 $ 919
Operating Segments                      
Disaggregation Of Revenue [Line Items]                      
TOTAL NONINTEREST INCOME                 28,602 25,499  
Operating Segments | Service Charges on Deposit Accounts                      
Disaggregation Of Revenue [Line Items]                      
Noninterest income                 4,514 4,254  
Operating Segments | Debit Card and EFT Fees                      
Disaggregation Of Revenue [Line Items]                      
Noninterest income                 3,522 3,351  
Operating Segments | Trust Fees                      
Disaggregation Of Revenue [Line Items]                      
Noninterest income                 7,475 7,126  
Operating Segments | Insurance Agency Commissions                      
Disaggregation Of Revenue [Line Items]                      
Noninterest income                 2,919 2,621  
Operating Segments | Retirement Plan Consulting Fees                      
Disaggregation Of Revenue [Line Items]                      
Noninterest income                 1,489 1,684  
Operating Segments | Investment Commissions                      
Disaggregation Of Revenue [Line Items]                      
Noninterest income                 1,406 1,103  
Operating Segments | Other                      
Disaggregation Of Revenue [Line Items]                      
Other (outside the scope of ASC 606)                 7,277 5,360  
Operating Segments | Trust Segment                      
Disaggregation Of Revenue [Line Items]                      
TOTAL NONINTEREST INCOME                 8,964 8,810  
Operating Segments | Trust Segment | Service Charges on Deposit Accounts                      
Disaggregation Of Revenue [Line Items]                      
Noninterest income                 0 0  
Operating Segments | Trust Segment | Debit Card and EFT Fees                      
Disaggregation Of Revenue [Line Items]                      
Noninterest income                 0 0  
Operating Segments | Trust Segment | Trust Fees                      
Disaggregation Of Revenue [Line Items]                      
Noninterest income                 7,475 7,126  
Operating Segments | Trust Segment | Insurance Agency Commissions                      
Disaggregation Of Revenue [Line Items]                      
Noninterest income                 0 0  
Operating Segments | Trust Segment | Retirement Plan Consulting Fees                      
Disaggregation Of Revenue [Line Items]                      
Noninterest income                 1,489 1,684  
Operating Segments | Trust Segment | Investment Commissions                      
Disaggregation Of Revenue [Line Items]                      
Noninterest income                 0 0  
Operating Segments | Trust Segment | Other                      
Disaggregation Of Revenue [Line Items]                      
Other (outside the scope of ASC 606)                 0 0  
Operating Segments | Bank Segment                      
Disaggregation Of Revenue [Line Items]                      
TOTAL NONINTEREST INCOME                 19,638 16,689  
Operating Segments | Bank Segment | Service Charges on Deposit Accounts                      
Disaggregation Of Revenue [Line Items]                      
Noninterest income                 4,514 4,254  
Operating Segments | Bank Segment | Debit Card and EFT Fees                      
Disaggregation Of Revenue [Line Items]                      
Noninterest income                 3,522 3,351  
Operating Segments | Bank Segment | Trust Fees                      
Disaggregation Of Revenue [Line Items]                      
Noninterest income                 0 0  
Operating Segments | Bank Segment | Insurance Agency Commissions                      
Disaggregation Of Revenue [Line Items]                      
Noninterest income                 2,919 2,621  
Operating Segments | Bank Segment | Retirement Plan Consulting Fees                      
Disaggregation Of Revenue [Line Items]                      
Noninterest income                 0 0  
Operating Segments | Bank Segment | Investment Commissions                      
Disaggregation Of Revenue [Line Items]                      
Noninterest income                 1,406 1,103  
Operating Segments | Bank Segment | Other                      
Disaggregation Of Revenue [Line Items]                      
Other (outside the scope of ASC 606)                 $ 7,277 $ 5,360